Black Series Pro Series Cam Gears for Honda's B-series and H23A1 engines enable serious tuners to optimize horsepower and torque by being able to adjust camshaft timing +/- 10 degrees, allowing them to tailor the power curve appropriately. Pro Series Cam Gears feature precision-machined, hard-anodized teeth to reduce premature wear with a signature, six-bolt design that eliminates gear slipping.